The real and the digital worlds are converging, thanks to a proliferation of connected sensors and cameras, ubiquitous wireless networks, communications standards and the activities of humans themselves. This convergence may not be instantly discernible, because it is happening in many places at once and is often not understood for what it is. It is most advanced in controlled environments. For example, software developed by Siemens, a technology conglomerate, maintains virtual replicas of factories to monitor and reconfigure them.